Intersil HIP6302EVAL1 Application Note

Introduction
Each generation of computer microprocessor brings
performance advances in computing power. Performance
improvements are made possible by advances in fabrication
technology that enable greater device density. Newer
processors are operating at lower voltages and higher clock
speeds both of which contribute to greater demands on the
microprocessor core voltage supply in terms of higher peak
currents and higher current-slew rates.
Intersil's family of multi-phase DC-DC converter solutions
provide the ideal solution to supply the core-voltage needs of
present and future high-performance microprocessors.
Intersil HIP6302 and HIP6601
The HIP6302 controller IC works with two HIP6601A or
HIP6603A single-channel driver ICs or a single HIP6602A
dual-channel driver IC [3] to form a highly integrated solution
for high-current, high slew-rate applications. The HIP6302
regulates output voltage, balances load currents and
provides protective functions for two synchronous-rectified
buck-converter channels.
PGOOD
15
UV
VSEN
10
+
-
x 0.9
OV
LATCH
S
OVP
x 1.15
+
-
SOFT START
AND FAULT
LOGIC
COMP 6
VID4 1
VID3 2
E/A
VID2 3
DAC
+
-
VID1 4
VID0 5
FB 7
+
∑
+
FIGURE 1. HIP6302 BLOCK DIAGRAM
The integrated high-bandwidth error amplifier provides
voltage regulation, while current-sense circuitry maintains
phase-current balance between the two power channels and
HIP6302EVAL1 - Multiphase Power Conversion
TM
Application Note
VCC
16
POWER-ON
RESET (POR)
THREE STATE
CLOCK AND
SAWTOOTH
GENERATOR
PWM
+
∑
+
-
-
PWM
+
∑
+
-
-
CURRENT
DETECTION
9
GND
1
for AMD Athlon Processors up to 35A
February 2002
provides feedback for droop compensation and over-current
protection. A five-bit DAC provides a digital interface to
program the 1% accurate reference and a window
comparator toggles PGOOD if the output voltage is out of
range and acts to protect the load in case of over voltage.
For more detailed descriptions of the HIP6302 functionality,
refer to the HIP6302 Data Sheet [1].
The HIP6601A is a driver IC capable of delivering up to 2A of
gate-charging current for rapidly switching both MOSFETs in
a synchronous-rectified bridge. The HIP6601A accepts a
single logic input to control both upper and lower MOSFETs.
Adaptive shoot-through protection is provided on both
switching edges to provide optimal dead time, and bootstrap
circuitry permits greater enhancement of the upper
MOSFET. For a more detailed description of the HIP6601A,
refer to the HIP6601A Data Sheet [2].
PVCC 7
VCC 6
+5V
PWM 3
8
FS/DIS
10k
FIGURE 2. HIP6601A BLOCK DIAGRAM
The HIP6302EVAL1 Board and Reference
13 PWM1
Design
With the VID jumpers set to 1.7V (00110), the evaluation
12 PWM2
board meets the output voltage and current specifications
indicated in Table 1.
TABLE 1. HIP6302EVAL1 OUTPUT PARAMETERS
14 ISEN1
Static Regulation
ISEN2
11
Transient Regulation
Over-Voltage Protection
Continuous Load Current
Over-Current Trip Level
Load-Current Transient
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
Author: Matt Harris
10k
SHOOT
CONTROL
THROUGH
LOGIC
PROTECTION
4
GND
MIN
1.65V
1.60V
1.90V
-
41A
-
|
Intersil (and design) is a trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2002. All Rights Reserved
AN9888.1
2 BOOT
1 UGATE
8 PHASE
5 LGATE
MAX
1.75V
1.85V
2.00V
35A
57A
35A/µs